def send_message(accessToken, openID, message):
    """
    客服接口-发消息
    :param accessToken: 调用接口凭证
    :param openID: 接收方账号
    :param message: 消息
    :return:
    """
    url = (f"https://api.weixin.qq.com/cgi-bin/message/custom/send?"
           f"access_token={accessToken}")
    data = {
        "touser": f"{openID}",
        "msgtype": "text",
        "text":
            {
                "content": message
            }
    }
    response = requests.post(url, data=data)
    return response.json()

错误码: {'errcode': 40003, 'errmsg': 'invalid openid rid: 6791c969-2df2b561-5de66934'}